Black box



FIG. 1 is a perspective view of a black box showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof

FIG. 4 is a side elevational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines are directed to environment only and form no part of the claimed design. 

CLAIM The ornamental design for a black box, as shown and described. 